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Old 06-07-2008, 08:53 AM   #15
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Originally Posted by markdoane View Post
My Sam's Club has the 6V-220ah golf cart batteries on sale for $66.
I wish I had a pair.
$66 At that price, they are almost disposable!!! The 4/0 cabling in my van's solar charging and inverter system cost more than that.
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Old 06-12-2008, 04:24 PM   #16
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Where are you placing the golf cart batteries? My AS has two battery doors, but it appears golf cart batteries are too large for the space??
Roger
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Old 06-12-2008, 04:48 PM   #17
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It's really simple, the more AH's in your battery system, the longer you can run your stuff!
use watt hours!

Lead acid batteries for RV's have about 22 watt hours per pound. The differences involve the cost, durability, and capacity trade-offs - not voltage or case size or whatever.

Quote:
They had 2 years warranties and usually died in 2 years and 2 months.
This is an example of the kind of misleading anecdotal 'data' that often rides on an emotional fixation. I just replaced a 6 year old Exide in my B-Van and I have Costco 12v gr 27's that are starting their 4th year. I have also seen Trojan T 105's that didn't survive one season. -- Doesn't fit the 'just over warranty' implication and probably worth just as much.

The fact is that any of these lead acid batteries should last 4 - 7 years. If you don't get that kind of life from them you need to look at how you use and maintain them.

Again, the data (e.g. the Az Wind Sun FAQ) does not discriminate life expectancy as per the conventional wisdom you often see here.

Quote:
Ultimate 'life' of any lead-acid battery depends on how well the user takes care of it...keeping it fully charged, cells watered, connections cleaned of corrosion, etc.
...
The internal construction is some what similar, however ...
I'd be very careful about generalities - consider the T105 vs T145 as compared to the SCS series. The fact is that the differences are more of degree rather than kind and the size or voltage is not the issue. If you look you will find that you can cover the range for any particular size or voltage. Capacity, cost, durability - choose any 2.

Quote:
it appears golf cart batteries are too large for the space??
get the biggest batteries that will fit that are intended for RV service from a reputable retailer - don't fuss over irrelevancies such as the golf cart myths. Your Airstream isn't a golf cart.
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Old 06-13-2008, 07:35 PM   #18
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Originally Posted by rogerdodger View Post
Where are you placing the golf cart batteries? My AS has two battery doors, but it appears golf cart batteries are too large for the space??
Roger
Hi Roger,

We got tired of looking for a battery and box that would fit on the hitch, so we decided to get what we want and put them in the truck. We then found a heavy duty tote (vented) with hinged lid that would hold both. If we want to use the truck we just take them out and put them under the front of the trailer. Not very fancy, but it works for us!
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Old 06-13-2008, 11:26 PM   #19
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Another good idea.
Thanks,

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Old 09-08-2017, 03:15 PM   #20
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'Golf Cart' batteries are usually shown as a #GC2 in most mfg's spec sheets.

Typical lead-acid deep cycle offered to the RV trade are not designed to sustain large discharges every cycle...it's a cost thing! Most Mfg's suggest a 50% discharge usage to get optimal life. If you want batteries that will perform to 80% cycles, you'll have to spend LOTS more money for low production type, specialized applications.

There is no equivalent common single 12 volt battery with the same rating as a pair of 6 volt golf cart batteries. Deep Cycle batteries are rated in Amp Hours at a 20 hour discharge rate...these ratings are used so we can compare batteries, or battery systems. Divide the AH rate by 20 to get the optimum Amperage discharge rate per hour till the battery drops to about 1.75 volts per cell (10.5 volts in a 12 volt battery).

It's really simple, the more AH's in your battery system, the longer you can run your stuff! If you can design your system so that you only have to use 50% of it's capacity, you should enjoy the longest ultimate life of the system.

Most GC2 batteries are rated at 225 AH's these days. When you hook a pair in SERIES, you double the voltage to 12 volts, and the AH rating remains the same 225 AH's.

Conversely, when you hook a pair of similar 12 volt batteries in PARALLEL, the voltage remains at 12 volts, and the AH capacity doubles.

Ultimate 'life' of any lead-acid battery depends on how well the user takes care of it...keeping it fully charged, cells watered, connections cleaned of corrosion, etc. 'Life' of 6 volts versus 12 volt types will be similar...

The internal construction is some what similar, however the GC2 6 volt Deep cycle's use a rubber separator between plates that do a better job of keeping the grids in place. The grids are of a greater thickness also. Batteries used in a golf cart, bouncing around the fairways need to be vibration resistant. GC2's rarely fail due to plates shorting against each other because of the special separator...so, in effect, the GC2's might have a longer service life, other things being equal.

There are exceptions in the market place, and there are mfg's that specialize if 'heavier' construction for special uses, with much higher costs...but we are talking about batteries generally available to we RV'ers.

I like the GC2's for RV, boat and small rural solar uses...you usually get the most AH's for the money, and they are readily available.
I noted that my battery box on my 2017 AS is much deeper than my 2007. Can I assume that GC2's will fit the 2017 w/o modifying the battery box?
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Old 09-08-2017, 03:21 PM   #21
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Quote:
Originally Posted by zapper View Post
I noted that my battery box on my 2017 AS is much deeper than my 2007. Can I assume that GC2's will fit the 2017 w/o modifying the battery box?
No.

At a minimum, you need to measure. If your battery supplier is close by, it would be best to tow your American Classic over, and dry-fit the batteries before purchase.

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Old 09-08-2017, 04:34 PM   #22
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Hi

Consider that in normal use, batteries can (and do) swell up. You don't just need room for the batteries in "as new" condition. They also will swell if they freeze (yes it can happen) or under some fault conditions. You do *not* want to pack them tight into a box. That's one of the reasons the "stock" battery boxes seem a bit big for the cells they put in them.

Bob
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Old 09-18-2017, 10:25 AM   #23
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6 volt batteries

I have a 1988 325 I switched out the two 12 volt 10 years ago when I started my Refurb. I went to two 6 volts they were taller so I took the battery tray to a welding friend he added 2 1/2 inches of stainless steal to bottom of tray, deepening tray worked perfectly. The added life of 6 volt batteries is well documented by just looking at golf carts! I maintain the batteries religiously and will get 10 years from these batteries.I use a battery tender. thanks Jonathan
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Old 09-18-2017, 01:09 PM   #24
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Over five years ago we put this pair of GC2 6V batteries into our 2005 25 ft's battery box. Width and length are perfect, but battery height was over an inch excessive. No problem, formed C-channel as height extensions for battery box.

Because of good battery management by my solar controller and Intellipower converter/charger, this 5.5 year old pair of batteries test nearly perfect. No measurable swelling, great charge cycles still. BTW, we top off at four or five weeks the cells with distilled water. Also keep cells evenly filled, clean and free of any contamination by using a filling manifold. I think there are pictures in my forums gallery. If not I'll add a couple to show this.

The switch to GC2 batteries has been just right for us. Glad they fit our battery box so well, approx 3/4" overall margin on N side, half that on E and W because of the 3/8" tie down bolt.
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